[JAVA] Environment construction, simple confirmation and skill test for each language

Introduction

This is a rough summary of how to build an environment for a language you use most recently and how to quickly check its operation. If you just want to give it a try, Ideone "[Ideone.com --Online Compiler and IDE >> C / C ++, Java, PHP, Python, Perl and 40+ other compilers and interpreters](https: // ideone) .com /) "is amazing, and that might be enough.

Development environment

If you don't want to install various things, you may be able to add Docker and images of various environments. If you want to check the code at the command line level, this may be faster than you think. (reference) Docker installation memo --Qiita

General

My personal preference is "Visual Studio Code" Download Visual Studio Code - Mac, Linux, Windows

C# For the time being, at "Visual Studio Community 2017" download| IDE、Code、Team Foundation Server | Visual Studio

Java, Scala For the time being, in "IntelliJ IDEA Community" Download IntelliJ IDEA: The Java IDE for Professional Developers by JetBrains

Python (reference) Install Python3 --python.jp

PHP (reference) PHP download and installation | PHP installation and initial settings

Simple confirmation

General

(reference) Various websites that allow you to quickly test the operation of code on a browser | Web Creator Box

C# Create a project like "Visual Studio Community 2017"

Java, Scala Create an appropriate project like "IntelliJ IDEA Community"

JavaScript I used "JSFiddle" for a while Create a new fiddle - JSFiddle

python I was doing it on the console as it was ... python

PHP I was doing it on the console as it was ... php -a

Test your skills

(reference) [Ideal for improving the level of IT engineers! 10 Competitive Programming Sites-paiza Development Diary](https://paiza.hatenablog.com/entry/2015/04/16/IT%E3%82%A8%E3%83%B3%E3%82%B8%E3 % 83% 8B% E3% 82% A2% E3% 81% AE% E3% 83% AC% E3% 83% 99% E3% 83% AB% E3% 82% A2% E3% 83% 83% E3% 83 % 97% E3% 81% AB% E6% 9C% 80% E9% 81% A9% EF% BC% 81% E7% AB% B6% E6% 8A% 80% E3% 83% 97% E3% 83% AD % E3% 82% B0% E3% 83% A9)

There used to be CodeIQ, but it seems that the service has ended. For the time being, "AtCoder" in Japanese? AtCoder

that's all.